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The simple fact is, no matter how long your sewer lines should last, you should be aware of the warning signs of a broken sewer line. Some classic examples that your sewer line needs repairs or to be replaces include: 1  Foul or strange odor in your yard. 2  As pipes age, both clay and PVC, they may become cracked or damaged.lay sewer pipes can typically last for 50 to 60 years. PVC (polyvinyl chloride) pipe was designed to last for long periods of time, typically over 100 years. After 1980 this pipe replaced the old version of clay pipes as the âgo toâ piping for sewer lines. However, both types of piping will eventually wear out.
separation distance between sewer and water lines be less than 6 feet. b. Line Crossings A minimum 18-inch vertical separation between the top of the sanitary sewer line and the bottom of the water line shall be required when the lines cross one another. When this separation cannot be met, concrete encasement of the sanitary sewer line shall be required for a minimum distance of 10 feet on either side of the point of crossing, and/or until the minimum 10-foot separation distance requirement is met (depending on the angle of crossing). Where a water main crosses below a sewer main, structural support must be provided for the sewer main to prevent any damage to the water main. These requirements shall apply to laterals (both water and sewer) as well as main line construction. 4.